Approved Used SL350 - how much is it worth?

[mercGLowner]

Just seen this AUC SL350, Southport MB, nice car. 2004(04 plate). I know he has it up for £20995, but how much is it actually worth (ie what would he take for it?) It hasn't got COMAND and it is in an unusual colour for an SL - Cubanite - not the usual Obsidian Black or Silver. It would be v hard to shift on come resale me thinks.

Will this car have the 7G auto box or did that come later?

http://www.mercedes-benz.motortrak.com/detail?temp...

[Not Ideal]

i like the colour!